Is Tetonka Lake Safe for Swimming?
Tetonka Lake in Le Sueur County, Minnesota has a water quality grade of F (Very Poor). Avoid swimming, very poor water quality, potential algae toxins. Water clarity: 3 ft visibility. Phosphorus: 289 µg/L. Chlorophyll-a (algae): 48 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | F (Very Poor) |
| Water Clarity (Secchi Depth) | 3 ft |
| Phosphorus | 289 μg/L |
| Chlorophyll-a (Algae) | 48 μg/L |
| Maximum Depth | 35 ft |
| Location | Le Sueur County, Minnesota |
How does Tetonka Lake compare?
With an overall water quality grade of F, Tetonka Lake falls below the Minnesota state average of Grade C. It ranks #6 of 13 lakes in Le Sueur County by water quality score.
Water clarity (Secchi depth) sits at 3 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment. Algae levels (chlorophyll-a) measure 48 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.